Creation of an incus recess for a middle-ear microphone using a drill or laser ablation: a comparison of equivalent noise level and middle ear transfer function.
Equivalent noise level
Laser Doppler vibrometry
Middle ear microphone
Middle ear transfer function
Noise-induced hearing loss
Journal
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
ISSN: 1434-4726
Titre abrégé: Eur Arch Otorhinolaryngol
Pays: Germany
ID NLM: 9002937
Informations de publication
Date de publication:
Feb 2023
Feb 2023
Historique:
received:
14
04
2022
accepted:
27
06
2022
pubmed:
15
7
2022
medline:
21
1
2023
entrez:
14
7
2022
Statut:
ppublish
Résumé
Studies have assessed the trauma and change in hearing function from the use of otological drills on the ossicular chain, but not the effects of partial laser ablation of the incus. A study of the effectiveness of a novel middle-ear microphone for a cochlear implant, which required an incus recess for the microphone balltip, provided an opportunity to compare methods and inform a feasibility study of the microphone with patients. We used laser Doppler vibrometry with an insert earphone and probe microphone in 23 ears from 14 fresh-frozen cadavers to measure the equivalent noise level at the tympanic membrane that would have led to the same stapes velocity as the creation of the incus recess. Drilling on the incus with a diamond burr created peak noise levels equivalent to 125.1-155.0 dB SPL at the tympanic membrane, whilst using the laser generated equivalent noise levels barely above the baseline level. The change in middle ear transfer function following drilling showed greater variability at high frequencies, but the change was not statistically significant in the three frequency bands tested. Whilst drilling resulted in substantially higher equivalent noise, we considered that the recess created by laser ablation was more likely to lead to movement of the microphone balltip, and therefore decrease performance or result in malfunction over time. For patients with greatly reduced residual hearing, the greater consistency from drilling the incus recess may outweigh the potential benefits of hearing preservation with laser ablation.
Identifiants
pubmed: 35834014
doi: 10.1007/s00405-022-07532-2
pii: 10.1007/s00405-022-07532-2
pmc: PMC9849174
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
661-669Subventions
Organisme : NIHR BioResource
ID : i4i Challenge Award
Organisme : NIHR BioResource
ID : II-C2-0713-20003
Informations de copyright
© 2022. The Author(s).
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